dmd_core 0.6.3

AT&T / Teletype DMD 5620 Terminal Emulator - Core Library
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

use std::error::Error;
use std::fmt;

#[derive(Debug)]
pub enum CpuException {
    IllegalOpcode,
    InvalidDescriptor,
    PrivilegedOpcode,
    IntegerZeroDivide,
}

impl fmt::Display for CpuException {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            CpuException::IllegalOpcode => write!(f, "Illegal Opcode"),
            CpuException::InvalidDescriptor => write!(f, "Invalid Descriptor"),
            CpuException::PrivilegedOpcode => write!(f, "Privileged Opcode"),
            CpuException::IntegerZeroDivide => write!(f, "Integer Zero Divide"),
        }
    }
}

impl Error for CpuException {
    fn description(&self) -> &str {
        match *self {
            CpuException::IllegalOpcode => "illegal opcode",
            CpuException::InvalidDescriptor => "invalid descriptor",
            CpuException::PrivilegedOpcode => "privileged opcode",
            CpuException::IntegerZeroDivide => "integer zero divide",
        }
    }

    fn cause(&self) -> Option<&Error> {
        match *self {
            CpuException::IllegalOpcode => None,
            CpuException::InvalidDescriptor => None,
            CpuException::PrivilegedOpcode => None,
            CpuException::IntegerZeroDivide => None,
        }
    }
}

#[derive(Debug)]
pub enum BusError {
    Init,
    Read(u32),
    Write(u32),
    NoDevice(u32),
    Range,
    Permission,
    Alignment,
}

impl fmt::Display for BusError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            BusError::Init => write!(f, "Could not initialize bus"),
            BusError::Read(addr) => write!(f, "Could not read from bus at address {:x}", addr),
            BusError::Write(addr) => write!(f, "Could not write to bus at address {:x}", addr),
            BusError::NoDevice(addr) => write!(f, "No device at address {:x}", addr),
            BusError::Range => write!(f, "Address out of range"),
            BusError::Permission => write!(f, "Invalid permission"),
            BusError::Alignment => write!(f, "Memory Alignment"),
        }
    }
}

impl Error for BusError {
    fn description(&self) -> &str {
        match *self {
            BusError::Init => "initialize",
            BusError::Read(_) => "read",
            BusError::Write(_) => "store",
            BusError::NoDevice(_) => "no device",
            BusError::Range => "out of range",
            BusError::Permission => "invalid permission",
            BusError::Alignment => "alignment",
        }
    }

    fn cause(&self) -> Option<&Error> {
        match *self {
            BusError::Init => None,
            BusError::Read(_) => None,
            BusError::Write(_) => None,
            BusError::NoDevice(_) => None,
            BusError::Range => None,
            BusError::Permission => None,
            BusError::Alignment => None,
        }
    }
}

#[derive(Debug)]
pub enum CpuError {
    Exception(CpuException),
    Bus(BusError),
}

impl fmt::Display for CpuError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            CpuError::Exception(ref e) => e.fmt(f),
            CpuError::Bus(ref e) => e.fmt(f),
        }
    }
}

impl Error for CpuError {
    fn description(&self) -> &str {
        match *self {
            CpuError::Exception(ref e) => e.description(),
            CpuError::Bus(ref e) => e.description(),
        }
    }

    fn cause(&self) -> Option<&Error> {
        match *self {
            CpuError::Exception(ref e) => Some(e),
            CpuError::Bus(ref e) => Some(e),
        }
    }
}

impl From<CpuException> for CpuError {
    fn from(err: CpuException) -> CpuError {
        CpuError::Exception(err)
    }
}

impl From<BusError> for CpuError {
    fn from(err: BusError) -> CpuError {
        CpuError::Bus(err)
    }
}